Electronic ballast unit with integral light sensor and circuit

Details Electronic ballast unit with integral light sensor and circuit Electronic ballast unit with integral light sensor and circuit

1986-12-11

1989-10-17

Groody, James J.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315 56, 315158, 315307, 315DIG5, 361377, H05B 4136

Patent

active

048749893

ABSTRACT:
An electronic ballast powers fluorescent lamps in a lighting fixture with a current of magnitude related to the frequency of the ballast output voltage. The ballast comprises self-oscillating inverter means wherein the frequency of oscillation can be influenced by receipt of a control signal at a control input connected in circuit with the inverter's positive feedback circuit. The ballast also comprises optical sensor means so positioned and constituted as to sense the light level within the lighting fixture and to provide a control signal commensurate with the light level. This control signal is then applied to the control input in such manner as to regulate the inverter frequency as a function of the light level, thereby correspondingly to regulate the magnitude of the current fed to the fluorescent lamps. By providing a threshold means in combination with high gain in the control loop, the fixture light level may be accurately maintained at any desired value substantially regardless of any changes in magnitude of power line voltage and/or in lamp efficacies.

REFERENCES:
patent: 3679931 (1972-07-01), Powell
patent: 3681654 (1974-08-01), Quinn
patent: 3901813 (1975-08-01), Potopinski
patent: 4207498 (1980-06-01), Spira et al.
patent: 4343032 (1982-08-01), Schwartz
patent: 4350935 (1982-09-01), Spira et al.
patent: 4417179 (1983-11-01), Fujimura et al.
patent: 4463284 (1984-07-01), Tamura et al.
patent: 4464606 (1984-08-01), Kane
patent: 4529912 (1985-07-01), Northup et al.
patent: 4533854 (1965-08-01), Northup
patent: 4595860 (1986-06-01), Taylor
patent: 4611266 (1986-09-01), Schwartz
patent: 4731551 (1988-03-01), Gibbs et al.

Affiliated with

Also associated with

Rating

Electronic ballast unit with integral light sensor and circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic ballast unit with integral light sensor and circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic ballast unit with integral light sensor and circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1745302